What should come in place of the question mark(?) in the following questions ?

316 + 412 - 223 - 11112 = ?

Select the Missing number?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
72 x 9 - 14 + 2 = ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

10 x 4 + 5 - 30 ÷ 6 = 31

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.

5 + 10 x 21 ÷ 5 - 15 = ?

Which of the following interchanges in signs and numbers will make the given equation correct?
8 x 9 + 2 = 74

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then 38 x 2 – 6 + 19 ÷ 35 = ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

1 ÷ 14 x 30 + 20 - 10 = 12

In a certain code language, '-' represents'+', '+' represents 'x', 'x' represents '÷' and '÷'represents '-'. Find out the answer to the following question.

2 - 12 + 10 x 5 ÷ 12 = ?